JP5690151B2

JP5690151B2 - Vehicle seat

Info

Publication number: JP5690151B2
Application number: JP2011008695A
Authority: JP
Inventors: 斎藤　健一; 健一斎藤; 晃二宇野; 尚人奥; 哲明望月; 励青
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2011-01-19
Filing date: 2011-01-19
Publication date: 2015-03-25
Anticipated expiration: 2031-01-19
Also published as: JP2012148667A

Description

この発明は、乗員の着座する車両用シートに関し、とりわけ、乗員の背部を支えるシートバック部分を改良した車両用シートに関するものである。 The present invention relates to a vehicle seat on which an occupant is seated, and more particularly to a vehicle seat having an improved seat back portion that supports the back of the occupant.

車両用シートとして、乗員に作用する後方荷重をシートバックの広い面で安定的に支持できるようにしたものが案出される（特許文献１参照）。
特許文献１に記載の車両用シートは、シートバックの外枠部を成すシートバックフレームの内側に、全域での撓み変形が可能な樹脂製の支持プレートが配置され、その支持プレートがワイヤスプリングによってシートバックフレームに連結された構造とされている。この車両用シートは、乗員の背部の広範囲を支持する支持プレートが設けられているため、乗員に背中を沈み込ませるような後方荷重が作用すると、その荷重が支持プレートの広い面をもって安定的に支えられることになる。 As a vehicle seat, a vehicle seat that can stably support a rear load acting on an occupant on a wide surface of a seat back is devised (see Patent Document 1).
In the vehicle seat described in Patent Document 1, a resin support plate that can be bent and deformed in the entire region is disposed inside a seat back frame forming an outer frame portion of the seat back, and the support plate is formed by a wire spring. The structure is connected to the seat back frame. Since this vehicle seat is provided with a support plate that supports a wide range of the back of the occupant, when a rear load is applied that causes the back of the occupant to sink, the load is stably spread over the wide surface of the support plate. It will be supported.

また、これとは別の車両用シートとして、車両後方から衝撃荷重が入力されたときに、乗員の頭部とヘッドレストの初期空間分と、乗員の背部から腰部に亙る領域をシートバックに積極的に沈み込ませて、頭部と体幹の前後方向の位相発生を抑制することによって乗員の頸部を保護するものが案出されている（特許文献２参照）。
特許文献２に記載の車両用シートは、シートバックフレームのシート幅方向に複数のＳばねが架け渡され、Ｓばねとシートバックフレームの間に、乗員からＳばねに所定値以上の荷重が作用したときに伸び変形する連結部材が介装されている。この車両用シートは、連結部材がジグザグに折り畳んだ鋼帯によって構成され、車両後方からの衝撃荷重を受けて乗員からＳばねに所定値以上の荷重が作用すると、今まで折り畳まれていた連結部材が伸び、それによってＳばね全体の後方変位が許容され、乗員の背部から腰部に亙る領域が深く沈み込むことになる。 In addition, as a separate vehicle seat, when an impact load is input from the rear of the vehicle, the seat space is positive for the initial space of the occupant's head and headrest, and the area from the occupant's back to the waist. Has been devised to protect the occupant's neck by suppressing the phase generation in the front-rear direction of the head and trunk (see Patent Document 2).
In the vehicle seat described in Patent Document 2, a plurality of S springs are bridged in the seat width direction of the seat back frame, and a load of a predetermined value or more acts on the S spring from the occupant between the S spring and the seat back frame. A connecting member that stretches and deforms when inserted is interposed. This vehicle seat is constituted by a steel band in which a connecting member is folded in a zigzag, and when a load greater than a predetermined value is applied to an S spring from an occupant by receiving an impact load from the rear of the vehicle, the connecting member that has been folded so far This allows the rear displacement of the entire S spring to be allowed, and the region extending from the back of the occupant to the lumbar region sinks deeply.

特開２００６−１２２２９７号公報JP 2006-122297 A 特開平７−２９１００５号公報JP 7-291005 A

上述した前者のシートバック装置は、通常使用時に支持プレートの広い面をもって乗員の背部を安定的に支持することができるが、車両後方から衝撃荷重が作用したときに乗員の背部から腰部に亙る領域を深く沈み込ませて乗員の頸部を保護する機能を持たない。
このため、前者のシートバック装置に上述した後者の技術を適用することが考えられるが、後者の技術を単純に前者のシートバック装置に適用した場合には、支持プレートをシートバックフレームに連結する部分の構造が複雑になるうえ、その連結部のシート前後方向の占有スペースが大きくなり、シートバックの薄肉化を図るうえで不利となってしまう。 The former seat back device described above can stably support the occupant's back with a wide surface of the support plate during normal use, but the region that stretches from the occupant's back to the waist when an impact load is applied from the rear of the vehicle. It has no function to protect the occupant's neck by sinking deeply.
For this reason, it is conceivable to apply the latter technique described above to the former seat back apparatus, but when the latter technique is simply applied to the former seat back apparatus, the support plate is connected to the seat back frame. The structure of the portion becomes complicated, and the space occupied by the connecting portion in the front-rear direction of the seat increases, which is disadvantageous in reducing the thickness of the seat back.

そこでこの発明は、乗員の背部を安定的に支持しつつ、構造の複雑化やシートバックの厚肉化を招くことなく、車両後方からの衝撃荷重の入力時には乗員の背部から腰部に亙る領域を深く沈み込ませることのできる車両用シートを提供しようとするものである。 In view of this, the present invention stably supports the occupant's back, and does not increase the complexity of the structure or increase the thickness of the seat back. An object of the present invention is to provide a vehicle seat that can be deeply depressed.

この発明に係る車両用シートでは、上記課題を解決するために以下の手段を採用した。
請求項１に係る発明は、シートバック（例えば、実施形態のシートバック３）の外枠部を成すシートバックフレーム（例えば、実施形態のシートバックフレーム１３）と、このシートバックフレームの幅方向内側に配置されて、乗員から作用する後方荷重を支持する撓み変形可能な板状支持ブロック（例えば、実施形態の支持プレート１０）と、前記板状支持ブロックを前記シートバックフレームに連結する、ばね特性を有するワイヤ部材（例えば、実施形態のワイヤ部材１４，１５）と、を備えた車両用シートにおいて、前記ワイヤ部材に撓み部（例えば、実施形態のＵ字湾曲部１５ｂ）が設けられるとともに、前記板状支持ブロックに前記ワイヤ部材の前記撓み部の変位を拘束するワイヤ拘束部（例えば、実施形態の第１突起１７及び第２突起１８）が設けられ、前記ワイヤ拘束部は、前記板状支持ブロックに突設されて前記ワイヤ部材の撓み部の近傍を係止する突起部（例えば、実施形態の第１突起１７及び第２突起１８）によって構成され、前記ワイヤ部材は、所定値以上の荷重が乗員から前記板状支持ブロックに作用したときに、前記突起部を乗り越えることによって前記撓み部を変位させることを特徴とするものである。
この場合、乗員の通常着座時に乗員の荷重が板状支持ブロックに作用すると、板状支持ブロックの全域が撓み変形しつつ、乗員の荷重がワイヤ部材を弾性変形させつつシートバックフレームに伝達される。このとき、ワイヤ部材の弾性によって比較的小さな衝撃や振動が吸収される。一方、車両後方から大きな衝撃荷重が入力されて、乗員から板状支持ブロックに大きな後方荷重が作用すると、ワイヤ部材の撓み部の変位を拘束していたワイヤ拘束部がその変位拘束を解除する。これにより、ワイヤ部材の撓み部が伸び、板状支持ブロックの後方変位が許容されることになり、乗員の背部から腰部に亙る領域が深く沈み込むことになる。 The vehicle seat according to the present invention employs the following means in order to solve the above problems.
The invention according to claim 1 is a seat back frame (for example, the seat back frame 13 of the embodiment) forming the outer frame portion of the seat back (for example, the seat back 3 of the embodiment), and an inner side in the width direction of the seat back frame A plate-like support block (e.g., the support plate 10 of the embodiment) that is disposed in the rear and supports a rear load acting from an occupant, and connects the plate-like support block to the seat back frame. In a vehicle seat provided with a wire member (for example, the wire members 14 and 15 of the embodiment), the wire member is provided with a bending portion (for example, the U-shaped curved portion 15b of the embodiment), and A wire restraining portion that restrains the displacement of the bending portion of the wire member on the plate-like support block (for example, the first protrusion 17 and the first protrusion of the embodiment). Protrusions 18) is provided, the wire restricting portion, the plate-like support protrusion blocks are projected for locking the vicinity of the flexures of the wire member (e.g., the first protrusion 17 of the embodiment and the second The wire member is formed by a protrusion 18), and when the load of a predetermined value or more is applied to the plate-like support block from an occupant, the wire member displaces the bending portion by overcoming the protrusion. It is.
In this case, when the occupant's load acts on the plate-like support block during normal seating of the occupant, the entire area of the plate-like support block is bent and deformed, and the occupant's load is transmitted to the seat back frame while elastically deforming the wire member. . At this time, a relatively small impact or vibration is absorbed by the elasticity of the wire member. On the other hand, when a large impact load is input from the rear of the vehicle and a large rear load acts on the plate-like support block from the occupant, the wire restraint portion that restrains the displacement of the bending portion of the wire member releases the displacement restraint. Thereby, the bending part of a wire member will be extended, the back displacement of a plate-shaped support block will be accept | permitted, and the area | region ranging from a passenger | crew's back part to a waist | lumbar part will sink deeply.

請求項２に係る発明は、請求項１に係る車両用シートにおいて、前記ワイヤ部材とワイヤ拘束部とは、前記板状支持ブロックに所定値以上の荷重が作用して前記撓み部の変位の拘束が一度解除された後に、前記所定値以上の荷重が解放されたときに、前記ワイヤ部材の弾性による形状復帰によって前記撓み部の変位が前記ワイヤ拘束部に拘束される初期状態に戻されるように設定されていることを特徴とするものである。 According to a second aspect of the present invention, in the vehicle seat according to the first aspect, the wire member and the wire restraint portion restrain the displacement of the flexure portion by applying a load of a predetermined value or more to the plate-like support block. When the load of the predetermined value or more is released after the release is released, the deformation of the flexible portion is returned to the initial state where the wire member is restrained by the elastic shape of the wire member. It is characterized by being set.

請求項３に係る発明は、請求項１または２に係る車両用シートにおいて、前記板状支持ブロックには、前記ワイヤ部材が前記突起部を乗り越えるときに、前記ワイヤ部材の所定量以上の変位を規制する変位規制部（例えば、実施形態の変位規制ブロック１９）が設けられていることを特徴とするものである。 According to a third aspect of the present invention, in the vehicle seat according to the first or second aspect, the plate-like support block is displaced by a predetermined amount or more when the wire member gets over the protrusion. A displacement restricting portion to be restricted (for example, the displacement restricting block 19 of the embodiment) is provided .

請求項４に係る発明は、シートバックの外枠部を成すシートバックフレームと、このシートバックフレームの幅方向内側に配置されて、乗員から作用する後方荷重を支持する撓み変形可能な板状支持ブロックと、前記板状支持ブロックを前記シートバックフレームに連結する、ばね特性を有するワイヤ部材と、を備えた車両用シートにおいて、前記ワイヤ部材に撓み部が設けられるとともに、前記板状支持ブロックに前記ワイヤ部材の前記撓み部の変位を拘束するワイヤ拘束部が設けられ、前記ワイヤ拘束部は、前記ワイヤ部材の前記撓み部の近傍を係止し一方向が係脱可能に開放されたフック部（例えば、実施形態の係止フック２９）によって構成され、前記ワイヤ部材は、所定値以上の荷重が乗員から前記板状支持ブロックに作用したときに、前記フック部による前記撓み部の近傍の係止が外れることによって前記撓み部を変位させることを特徴とするものである。 According to a fourth aspect of the present invention, there is provided a seat back frame that forms an outer frame portion of the seat back, and a plate-shaped support that is arranged on the inner side in the width direction of the seat back frame and supports a rear load acting from an occupant. A vehicular seat comprising a block and a wire member having a spring characteristic for connecting the plate-like support block to the seat back frame, wherein the wire member is provided with a bending portion, and the plate-like support block A wire restraining portion for restraining the displacement of the bending portion of the wire member is provided, and the wire restraining portion locks the vicinity of the bending portion of the wire member and is opened so that one direction can be engaged and disengaged. (For example, the locking hook 29 of the embodiment), and the wire member has a load of a predetermined value or more acting on the plate-like support block from the occupant. To, and is characterized in that for displacing the deflection portion by engaging in the vicinity of the deflection portion by the hook portion is disengaged.

請求項５に係る発明は、請求項４に係る車両用シートにおいて、前記ワイヤ部材とワイヤ拘束部とは、前記板状支持ブロックに所定値以上の荷重が作用して前記撓み部の変位の拘束が一度解除された後に、前記所定値以上の荷重が解放されたときに、前記ワイヤ部材の弾性による形状復帰によって前記撓み部の変位が前記ワイヤ拘束部に拘束される初期状態に戻されるように設定されていることを特徴とするものである。 According to a fifth aspect of the present invention, in the vehicle seat according to the fourth aspect , the wire member and the wire restraint portion restrain the displacement of the flexure portion by applying a load of a predetermined value or more to the plate-like support block. When the load of the predetermined value or more is released after the release is released, the deformation of the flexible portion is returned to the initial state where the wire member is restrained by the elastic shape of the wire member. It is characterized by being set.

請求項６に係る発明は、シートバックの外枠部を成すシートバックフレームと、このシートバックフレームの幅方向内側に配置されて、乗員から作用する後方荷重を支持する撓み変形可能な板状支持ブロックと、前記板状支持ブロックを前記シートバックフレームに連結する、ばね特性を有するワイヤ部材と、を備えた車両用シートにおいて、前記ワイヤ部材に撓み部が設けられるとともに、前記板状支持ブロックに前記ワイヤ部材の前記撓み部の変位を拘束するワイヤ拘束部が設けられ、前記ワイヤ拘束部は、所定値以上の荷重が乗員から前記板状支持ブロックに作用したときに、前記撓み部の変位の拘束を解除し、前記ワイヤ部材とワイヤ拘束部とは、前記板状支持ブロックに前記所定値以上の荷重が作用して前記撓み部の変位の拘束が一度解除された後、前記所定値以上の荷重が解放されても、前記撓み部が前記ワイヤ拘束部に拘束されて変位が戻らないように設定されていることを特徴とするものである。 According to a sixth aspect of the present invention, there is provided a seat back frame forming an outer frame portion of the seat back, and a plate-shaped support that is disposed on the inner side in the width direction of the seat back frame and supports a rear load acting from an occupant and is deformable. A vehicular seat comprising a block and a wire member having a spring characteristic for connecting the plate-like support block to the seat back frame, wherein the wire member is provided with a bending portion, and the plate-like support block A wire restraining portion for restraining the displacement of the bending portion of the wire member is provided, and the wire restraining portion is configured to prevent the displacement of the bending portion when a load of a predetermined value or more is applied to the plate-like support block from an occupant. The restraint is released, and the wire member and the wire restraining portion are configured such that a load of the predetermined value or more acts on the plate-like support block to restrain the displacement of the bending portion. After being time released, it is released more than the predetermined load, in which the deflection unit is characterized in that the displacement is constrained is set not return to the wire restricting portion.

請求項１，４，６に係る発明によれば、板状支持ブロックにワイヤ部材の撓み部の変位を拘束するワイヤ拘束部が設けられ、所定値以上の荷重が乗員から板状支持ブロックに作用したときに、ワイヤ拘束部が撓み部の変位の拘束を解除して板状支持ブロックの後方変位を許容する構造とされているため、板状支持ブロックによって乗員の背部を安定的に支持しつつ、構造の複雑化やシートバックの厚肉化を招くことなく、車両後方からの衝撃荷重の入力時には乗員の背部から腰部に亙る領域を深く沈み込ませ、乗員の頚部を確実に保護することができる。 According to the first , fourth , and sixth aspects of the invention, the plate-like support block is provided with the wire restraining portion that restrains the displacement of the bending portion of the wire member, and a load of a predetermined value or more acts on the plate-like support block from the passenger. In this case, since the wire restraint portion is configured to release the restraint of the displacement of the bending portion and to allow the rearward displacement of the plate-like support block, the plate-like support block stably supports the back of the occupant. Without damaging the structure or increasing the thickness of the seat back, the area from the back of the occupant to the waist can be deeply submerged when the impact load is input from the rear of the vehicle, ensuring that the occupant's neck is protected. it can.

さらに、請求項１に係る発明によれば、ワイヤ拘束部が、板状支持ブロックに突設されてワイヤ部材の撓み部の近傍を係止する突起部によって構成され、所定値以上の荷重が乗員から板状支持ブロックに作用したときに、ワイヤ部材が突起部を乗り越えることによって撓み部を変位させるようになっているため、極めて簡単な構造によってシートバックの薄肉化と乗員の頚部保護の両立を図ることができる。According to the first aspect of the present invention, the wire restraining portion is formed by a protruding portion that protrudes from the plate-like support block and engages the vicinity of the bending portion of the wire member, and a load greater than a predetermined value is applied to the occupant. Since the wire member moves over the protrusion when the plate member is applied to the plate-like support block, the flexure is displaced.Therefore, both the thinning of the seat back and the protection of the occupant's neck can be achieved with an extremely simple structure. Can be planned.

請求項２，５に係る発明によれば、板状支持ブロックに所定値以上の荷重が作用して撓み部の変位の拘束が一度解除された後に、所定値以上の荷重が解放されたときに、ワイヤ部材の弾性による形状復帰によって撓み部がワイヤ拘束部に拘束される初期状態に戻されるため、例えば、シートバックを後に倒した状態でシートバックの上で子供が膝をついて跳ねた場合であっても、特別な操作をすることなくワイヤ部材の撓み部を初期状態に戻すことができる。According to the second and fifth aspects of the present invention, when a load of a predetermined value or more is applied to the plate-like support block and the displacement restraint of the bending portion is once released, and then the load of the predetermined value or more is released. Since the bent portion is returned to the initial state where the wire restraint is restored by the elastic shape of the wire member, for example, when the child jumps on the seat back with the seat back tilted down, Even if it exists, the bending part of a wire member can be returned to an initial state, without performing special operation.

請求項３に係る発明によれば、板状支持ブロックに、ワイヤ部材が突起部を乗り越えるときに、ワイヤ部材の所定量以上の変位を規制する変位規制部が設けられているため、撓み部の過大な変位によってワイヤ部材が塑性変形するのを変位規制部によって規制し、ワイヤ部材の所期の性能を長期にわたって安定的に維持することができる。 According to the invention of claim 3 , since the plate-like support block is provided with the displacement restricting portion that restricts the displacement of the wire member by a predetermined amount or more when the wire member gets over the protruding portion, It is possible to restrict the plastic deformation of the wire member due to excessive displacement by the displacement restricting portion, and to maintain the desired performance of the wire member stably over a long period of time.

請求項４に係る発明によれば、ワイヤ拘束部が、ワイヤ部材の撓み部の近傍を係止し一方向が係脱可能に開放されたフック部によって構成され、所定値以上の荷重が乗員から板状支持ブロックに作用したときに、フック部による撓み部の近傍の係止が外れることによって撓み部を変位させるようになっているため、極めて簡単な構造によってシートバックの薄肉化と乗員の頚部保護の両立を図ることができる。 According to the invention which concerns on Claim 4 , a wire restraint part is comprised by the hook part which latched the vicinity of the bending part of a wire member, and was open | released so that one direction could be engaged / disengaged, and load more than predetermined value received from a passenger | crew When acting on the plate-like support block, the bent portion is displaced by releasing the hook in the vicinity of the bent portion, so the seat back is thinned and the occupant's neck is made extremely simple. It is possible to achieve both protection.

請求項６に係る発明によれば、板状支持ブロックに所定値以上の荷重が作用して撓み部の変位の拘束が一度解除された後には、所定値以上の荷重が解放されても、撓み部が拘束部に拘束されて変位が戻らないため、衝撃荷重の入力時に乗員の背部から腰部に亙る領域を充分に後退させることができる。 According to the sixth aspect of the present invention, after a load of a predetermined value or more is applied to the plate-like support block and the restraint of the displacement of the bending portion is once released, even if the load of the predetermined value or more is released, it is bent. Since the portion is restrained by the restraining portion and the displacement does not return, the region extending from the back of the occupant to the waist can be sufficiently retracted when the impact load is input.

この発明の第１の実施形態の車両用シートを前方側から見た斜視図である。It is the perspective view which looked at the vehicle seat of 1st Embodiment of this invention from the front side. この発明の第１の実施形態の車両用シートの骨格部を前方側から見た斜視図である。It is the perspective view which looked at the frame part of the vehicular seat of a 1st embodiment of this invention from the front side. この発明の第１の実施形態のシートバックの一部を示す背面図である。It is a rear view which shows a part of seat back of 1st Embodiment of this invention. この発明の第１の実施形態の通常着座時におけるシートバックの一部の背面図（Ａ）と、衝撃荷重の入力時におけるシートバックの一部の背面図（Ｂ）を併せて記載した図である。It is the figure which described together the rear view (A) of a part of seat back at the time of normal seating of the 1st embodiment of this invention, and the rear view (B) of a part of seat back at the time of input of impact load is there. この発明の第１の実施形態の通常着座時におけるシートバックの一部の斜視図（Ａ）と、衝撃荷重の入力時におけるシートバックの一部の斜視図（Ｂ）を併せて記載した図である。The figure which combined and described the perspective view (A) of a part of seat back at the time of normal seating of the 1st embodiment of this invention, and the perspective view (B) of a part of seat back at the time of input of an impact load is there. この発明の第１の実施形態のシートバックの変形例を示す背面図である。It is a rear view which shows the modification of the seat back of 1st Embodiment of this invention. この発明の第１の実施形態のシートバックの変形例を示す図６のＥ−Ｅ断面に対応する断面図である。It is sectional drawing corresponding to the EE cross section of FIG. 6 which shows the modification of the seat back of 1st Embodiment of this invention. この発明の第２の実施形態のシートバックの一部を示す背面図である。It is a rear view which shows a part of seat back of 2nd Embodiment of this invention. この発明の第２の実施形態のシートバックの図８のＡ−Ａ断面に対応する断面図である。It is sectional drawing corresponding to the AA cross section of FIG. 8 of the seat back of 2nd Embodiment of this invention. この発明の第２の実施形態のシートバックの図８のＢ−Ｂ断面に対応する断面図である。It is sectional drawing corresponding to the BB cross section of FIG. 8 of the seat back of 2nd Embodiment of this invention. この発明の第２の実施形態の変形例のシートバックの図８のＢ−Ｂ断面に対応する変形例の断面図である。It is sectional drawing of the modification corresponding to the BB cross section of FIG. 8 of the seat back of the modification of 2nd Embodiment of this invention. この発明の第２の実施形態の変形例のシートバックの図８のＡ−Ａ断面に対応する断面図である。It is sectional drawing corresponding to the AA cross section of FIG. 8 of the seat back of the modification of 2nd Embodiment of this invention. この発明の第３の実施形態のシートバックの一部を示す背面図である。It is a rear view which shows a part of seat back of 3rd Embodiment of this invention. この発明の第３の実施形態のシートバックの一部を示す斜視図である。It is a perspective view which shows a part of seat back of 3rd Embodiment of this invention. この発明の第３の実施形態のシートバックの図１４のＣ−Ｃ断面に対応する断面図である。It is sectional drawing corresponding to CC cross section of FIG. 14 of the seat back of 3rd Embodiment of this invention. この発明の第３の実施形態のシートバックの一部を示す斜視図である。It is a perspective view which shows a part of seat back of 3rd Embodiment of this invention. この発明の第３の実施形態のシートバックの図１６のＤ−Ｄ断面に対応する断面図である。It is sectional drawing corresponding to the DD cross section of FIG. 16 of the seat back of 3rd Embodiment of this invention. この発明の別の実施形態のシートバックの一部を示す斜視図である。It is a perspective view which shows a part of seat back of another embodiment of this invention. この発明の別の実施形態のシートバックの一部を示す斜視図である。It is a perspective view which shows a part of seat back of another embodiment of this invention. この発明のさらに別の実施形態のシートバックの一部を示す斜視図である。It is a perspective view which shows a part of seat back of another embodiment of this invention.

以下、この発明の実施形態を図面に基づいて説明する。なお、図面において、矢印Ｆは車両前方を指すものとする。
最初に、図１〜図５に示す第１の実施形態について説明する。
図１は、車両の前席左側に配置された車両用シート１を前部側斜め上方から見た斜視図であり、図２は、同車両用シート１の骨格部を前部側斜め上方から見た斜視図である。
車両用シート１は、乗員の臀部を支持するシートクッション２と、このシートクッション２の後端部に回動可能に連結されて、乗員の腰部及び背部を支持するシートバック３と、そのシートバック３の上部に支持されて、乗員の頭部及び首部を支持するヘッドレスト４とを備えている。 Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the arrow F indicates the front of the vehicle.
First, the first embodiment shown in FIGS. 1 to 5 will be described.
FIG. 1 is a perspective view of a vehicle seat 1 arranged on the left side of the front seat of the vehicle as seen from diagonally above the front side, and FIG. 2 shows the skeleton of the vehicle seat 1 from diagonally above the front side. FIG.
The vehicle seat 1 includes a seat cushion 2 that supports the occupant's buttocks, a seat back 3 that is pivotally connected to the rear end of the seat cushion 2 and supports the occupant's waist and back, and the seat back. 3 and a headrest 4 that supports the head and neck of the passenger.

シートクッション２は、図２に示すように、前後のパイプ材５Ａ，５Ｂと側部のプレート材６Ａ，６Ｂによって矩形枠状に形成されたクッションフレーム７を備え、そのクッションフレーム７がシートレール８，８を介して車体フロア９に前後スライド可能に取り付けられている。クッションフレーム７は、その上面側にウレタンフォーム等から成る図示しないパッド材が装着され、これらの外側が合成繊維や皮革等から成るシート表皮２６（図１参照）によって覆われている。 As shown in FIG. 2, the seat cushion 2 includes a cushion frame 7 formed in a rectangular frame shape by front and rear pipe members 5A and 5B and side plate members 6A and 6B. The cushion frame 7 is a seat rail 8. , 8 is attached to the vehicle body floor 9 so as to be slidable back and forth. The cushion frame 7 is provided with a pad material (not shown) made of urethane foam or the like on the upper surface side, and the outside thereof is covered with a seat skin 26 (see FIG. 1) made of synthetic fiber or leather.

シートバック３は、図２に示すように、上部フレーム部１３ａと左右の側部フレーム部１３ｃ，１３ｄと下部フレーム部１３ｂとからなる略矩形枠形状のシートバックフレーム１３を備え、このシートバックフレーム１３がシートバック３の外枠部を構成している。シートバックフレーム１３の幅方向内側（左右の側部フレーム部１３ｃ，１３ｄの間）には、後述する支持プレート１０（板状支持ブロック）が配置され、その支持プレート１０の前面側にウレタンフォーム等から成る図示しないパッド材が支持され、そのバッド材とシートバックフレーム１３の外側が合成繊維や皮革等から成るシート表皮２７（図１参照）によって覆われている。 As shown in FIG. 2, the seat back 3 includes a substantially rectangular frame-shaped seat back frame 13 including an upper frame portion 13a, left and right side frame portions 13c and 13d, and a lower frame portion 13b. Reference numeral 13 denotes an outer frame portion of the seat back 3. A support plate 10 (plate-like support block), which will be described later, is disposed on the inner side in the width direction of the seat back frame 13 (between the left and right side frame portions 13c and 13d), and urethane foam or the like is disposed on the front side of the support plate 10 A pad material (not shown) made of is supported, and the pad material and the outside of the seat back frame 13 are covered with a seat skin 27 (see FIG. 1) made of synthetic fiber, leather or the like.

図３は、支持プレート１０を背面側（後面側）から見た図である。
支持プレート１０は、撓み変形可能な合成樹脂によって正面視が略五角形状に形成され、シートバックフレーム１３の枠部形状にほぼ沿う矩形状のベース部１０ａと、そのベース部１０ａの下端部からシート幅方向中央に向かって下方に膨出する下端膨出部１０ｂと、を備えている。支持プレート１０の背面には、ばね特性を有する一対のワイヤ部材１４，１５が取り付けられている。支持プレート１０は、これらのワイヤ部材１４，１５を介してシートバックフレーム１３の両側の側部フレーム部１３ｃ，１３ｄに連結されている。一対のワイヤ部材１４，１５は、それぞれ支持プレート１０の上下に離間した部位に取り付けられ、これらの両端部がシート幅方向に延出してそれぞれ側部フレーム部１３ｃ，１３ｄに結合されている。 FIG. 3 is a view of the support plate 10 as seen from the back side (rear side).
The support plate 10 is formed in a substantially pentagonal shape when viewed from the front by a synthetic resin that can be bent and deformed, and has a rectangular base portion 10a that substantially conforms to the frame shape of the seat back frame 13, and a seat from the lower end portion of the base portion 10a. A lower end bulging portion 10b that bulges downward toward the center in the width direction. A pair of wire members 14 and 15 having spring characteristics are attached to the back surface of the support plate 10. The support plate 10 is connected to the side frame portions 13 c and 13 d on both sides of the seat back frame 13 through the wire members 14 and 15. The pair of wire members 14 and 15 are respectively attached to portions that are spaced apart from each other on the support plate 10, and both end portions thereof extend in the seat width direction and are respectively coupled to the side frame portions 13c and 13d.

図４は、支持プレート１０の下部側に取り付けられるワイヤ部材１５の動作状態を（Ａ），（Ｂ）に分けて示す図である。
同図にも示すように、支持プレート１０の下部側に取り付けられるワイヤ部材１５は、側部フレーム部１３ｃ，１３ｄとの結合部からシート幅の中央側に延出する側縁部がほぼ直線状に形成され（この部位を「直線部１５ａ」と呼ぶ。）、その両直線部１５ａ，１５ａの間に、下方に略Ｕ字状に湾曲するＵ字湾曲部１５ｂ（撓み部）が設けられている。このＵ字湾曲部１５ｂの両側の付根部と各直線部１５ａとの連接部分には、略直角に屈曲する屈曲係止部１５ｃが形成されている。なお、図中１５ｄは、Ｕ字湾曲部１５ｂの湾曲頂部である。 FIG. 4 is a diagram showing the operation state of the wire member 15 attached to the lower side of the support plate 10 separately in (A) and (B).
As shown in the figure, the wire member 15 attached to the lower side of the support plate 10 has a substantially straight side edge extending from the joint with the side frames 13c and 13d to the center side of the seat width. (This portion is referred to as “straight portion 15a”), and a U-shaped curved portion 15b (flexible portion) that is curved in a substantially U shape is provided between the straight portions 15a and 15a. Yes. A bent locking portion 15c that is bent substantially at a right angle is formed at a connecting portion between the root portion on both sides of the U-shaped curved portion 15b and each linear portion 15a. In addition, 15d in the figure is a curved top portion of the U-shaped curved portion 15b.

一方、支持プレート１０の背面側の下部には、ワイヤ部材１５の両側の直線部１５ａを係止する係止フック１６が設けられるとともに、ワイヤ部材１５の湾曲頂部１５ａの湾曲内側面と係合される第１突起１７と、ワイヤ部材１５の両側の屈曲係止部１５ｃの屈曲内側面と係合される一対の第２突起１８とが設けられている。この実施形態の場合、第１，第２突起１７，１８は支持プレート１０と別体の略円柱状の金属部品によって形成され、ボルト締結等によって支持プレート１０に固定されている。また、直線部１５ａを係止する係止フック１６は、直線部１５ａの上部と背部を覆うように下向きの略Ｌ字断面に形成され、直線部１５ａの上方変位と後方変位を規制するようになっている。ただし、係止フック１６は直線部１５ａの軸方向の変位を規制するものではなく、直線部１５ａは係止フック１６の内側で軸方向にスライド可能にされている。また、この実施形態においては、第１，第２突起１７，１８が突起部とワイヤ拘束部を構成している。 On the other hand, a locking hook 16 that locks the linear portions 15 a on both sides of the wire member 15 is provided at the lower portion on the back side of the support plate 10 and is engaged with the curved inner side surface of the curved top portion 15 a of the wire member 15. A first protrusion 17 and a pair of second protrusions 18 that are engaged with the bent inner surfaces of the bent locking portions 15 c on both sides of the wire member 15. In the case of this embodiment, the first and second protrusions 17 and 18 are formed of a substantially cylindrical metal part that is separate from the support plate 10 and fixed to the support plate 10 by bolt fastening or the like. Also, the locking hook 16 that locks the straight portion 15a is formed in a substantially downward L-shaped cross-section so as to cover the upper portion and the back portion of the straight portion 15a, and regulates the upward displacement and the backward displacement of the straight portion 15a. It has become. However, the locking hook 16 does not restrict the displacement of the linear portion 15 a in the axial direction, and the linear portion 15 a is slidable in the axial direction inside the locking hook 16. In this embodiment, the first and second protrusions 17 and 18 constitute a protrusion and a wire restraint.

ワイヤ部材１５は、湾曲頂部１５ｄが第１突起１７に係合された状態において、両側の屈曲係止部１５ｃが第２突起１８にそれぞれ係合され、それによりＵ字湾曲部１５ｂの伸び変位（開き変位）が規制されている。ただし、第２突起１８と屈曲係止部１５ｃの係合は、乗員の通常着座時に支持プレート１０に作用する程度の荷重（１０kgf以下の荷重）では外れず、乗員の通常着座時にはあり得ない所定値以上の荷重（１００kgf〜２００kgfの荷重）が乗員から支持プレート１０に作用したときに、屈曲係止部１５ｃが第２突起１８を乗り越えて第２突起１８から外れるように設定されている。 In the state in which the curved top portion 15d is engaged with the first protrusion 17, the wire member 15 is engaged with the bending protrusions 15c on both sides by the second protrusion 18, respectively. (Open displacement) is regulated. However, the engagement between the second protrusion 18 and the bending locking portion 15c does not come off with a load (load of 10 kgf or less) that acts on the support plate 10 when the occupant is normally seated, and is not possible when the occupant is normally seated. When a load greater than the value (a load of 100 kgf to 200 kgf) is applied to the support plate 10 from the occupant, the bending locking portion 15 c is set so as to get over the second protrusion 18 and come off the second protrusion 18.

また、支持プレート１０の下端膨出部１０ｂには、ワイヤ部材１５の両側の屈曲係止部１５ｃが第２突起１８を乗り越えて変位するときに、ワイヤ部材１５（Ｕ字湾曲部１５ｂ）の所定量以上の開き変位（伸び変位）を規制する一対の変位規制ブロック１９（変位規制部）が取り付けられている。この変位規制ブロック１９は、ワイヤ部材１５が塑性変形しない範囲に、ワイヤ部材１５の開き変位を規制する。 Further, the lower end bulged portion 10b of the support plate 10 is provided with the wire member 15 (U-shaped curved portion 15b) when the bending locking portions 15c on both sides of the wire member 15 move over the second protrusion 18 and are displaced. A pair of displacement restricting blocks 19 (displacement restricting portions) for restricting an opening displacement (elongation displacement) exceeding a fixed amount are attached. The displacement restricting block 19 restricts the opening displacement of the wire member 15 within a range where the wire member 15 is not plastically deformed.

図５は、支持プレート１０の上部側に取り付けられるワイヤ部材１４の動作状態を（Ａ），（Ｂ）に分けて示す図である。
同図にも示すように、支持プレート１０の上部側に取り付けられるワイヤ部材１４は、側部フレーム部１３ｃ，１３ｄとの結合部に隣接する側縁部が水平方向にほぼ直線状に延出する直線部１４ａとされ、左右の各直線部１４ａに隣接するシート幅方向内側の領域には、下方に略Ｕ字状に屈曲した屈曲部１４ｂ（撓み部）が設けられている。そして、ワイヤ部材１４の左右の屈曲部１４ｂは、略水平に延出する中央の連結部１４ｃによって連結されている。 FIG. 5 is a diagram illustrating the operation state of the wire member 14 attached to the upper side of the support plate 10 separately in (A) and (B).
As shown in the figure, the wire member 14 attached to the upper side of the support plate 10 has a side edge portion adjacent to the connecting portion with the side frame portions 13c and 13d extending substantially linearly in the horizontal direction. A bent portion 14b (flexible portion) that is bent downward in a substantially U shape is provided in a region on the inner side in the sheet width direction adjacent to the left and right straight portions 14a. The left and right bent portions 14b of the wire member 14 are connected by a central connecting portion 14c extending substantially horizontally.

一方、支持プレート１０の背面側の上部には、ワイヤ部材１４の両側の直線部１４ａを係止する係止フック２９（フック部，ワイヤ拘束部）が設けられている。また、支持プレート１０の背面側の上部には、ワイヤ部材１４の両側の屈曲部１４ｂの底部を係止する係止フック３０と、中央の連結部１４ｃを係止する係止フック３１が設けられている。ワイヤ部材１４の両側の直線部１４ａを係止する係止フック２９と、中央の連結部１４ｃを係止する係止フック３１は、直線部１４ａと連結部１４ｃの各上部と背部を覆うように下向きの略Ｌ字断面に形成されており、それぞれ直線部１４ａと連結部１４ｃの上方変位と後方変位を規制するようになっている。また、ワイヤ部材１４の両側の屈曲部１４ｂの底部を係止する係止フック３０は、屈曲部１４ｂの底部の下部と背部を覆うように上向きの略Ｌ字断面に形成され、屈曲部１４ｂの底部の下方変位と後方変位を規制するようになっている。なお、係止フック２９，３１は下方側に開放され、係止フック３０は上方側に解放されている。また、ワイヤ部材１４は、各係止フック２９，３０，３１の内側で軸方向にスライド可能にされている。 On the other hand, on the upper part on the back side of the support plate 10, a locking hook 29 (hook portion, wire restraining portion) that locks the linear portions 14 a on both sides of the wire member 14 is provided. Further, a locking hook 30 for locking the bottom of the bent portion 14b on both sides of the wire member 14 and a locking hook 31 for locking the central connecting portion 14c are provided on the upper part on the back side of the support plate 10. ing. A locking hook 29 that locks the straight portion 14a on both sides of the wire member 14 and a locking hook 31 that locks the central connecting portion 14c cover the upper and back portions of the straight portion 14a and the connecting portion 14c. It is formed in a downward substantially L-shaped cross section, and regulates upward displacement and backward displacement of the linear portion 14a and the connecting portion 14c, respectively. Further, the locking hooks 30 for locking the bottom portions of the bent portions 14b on both sides of the wire member 14 are formed in an upward substantially L-shaped cross section so as to cover the lower portion and the back portion of the bent portion 14b. The bottom displacement and the rear displacement are regulated. The locking hooks 29 and 31 are opened downward, and the locking hook 30 is released upward. The wire member 14 is slidable in the axial direction inside each of the locking hooks 29, 30, 31.

ワイヤ部材１４は、両側の直線部１４ａと中央の連結部１４ｃがそれぞれ係止フック２９，３１によって上方側を係止され、かつ、屈曲部１４ｂの底部が係止フック３０によって下方側を係止されているため、各屈曲部１４ｂの伸び変位はこれらの係止フック２９，３０，３１によって規制されている。ただし、これらの係止フック２９，３０，３１による係止は、乗員の通常着座時に支持プレート１０に作用する程度の荷重では外れず、乗員の通常着座時にはあり得ない所定値以上の荷重が乗員から支持プレート１０に作用したときに、図５（Ｂ）に示すように、直線部１４ａが係止フック２９内を軸方向に摺動して係止フック２９による直線部１４ａの係止が外れるように設定されている。 In the wire member 14, the straight portion 14a on the both sides and the central connecting portion 14c are locked on the upper side by the locking hooks 29 and 31, respectively, and the bottom of the bent portion 14b is locked on the lower side by the locking hook 30. Therefore, the extension displacement of each bent portion 14 b is regulated by these locking hooks 29, 30, 31. However, the locking by the locking hooks 29, 30, 31 does not come off with a load that acts on the support plate 10 when the occupant normally sits, and a load of a predetermined value or more that is impossible when the occupant normally sits 5B, the straight portion 14a slides in the locking hook 29 in the axial direction to release the locking of the straight portion 14a by the locking hook 29, as shown in FIG. Is set to

この車両用シート１は、以上のような構成であるため、乗員の通常着座時に乗員の上体の荷重がパッド材を介して支持プレート１０に作用すると、支持プレート１０の全域が同プレート１０のもつ弾性によって撓み変形すると同時に、乗員の荷重が上下のワイヤ部材１４，１５を介してシートバックフレーム１３に伝達されることになる。この間、振動や微小な衝撃がワイヤ部材１４，１５の持つ弾性によって吸収される。 Since the vehicle seat 1 is configured as described above, when the load on the occupant's upper body acts on the support plate 10 via the pad material when the occupant is normally seated, the entire area of the support plate 10 The occupant's load is transmitted to the seat back frame 13 via the upper and lower wire members 14 and 15 at the same time as being deformed by the elasticity. During this time, vibrations and minute impacts are absorbed by the elasticity of the wire members 14 and 15.

一方、車両後方から大きな衝撃荷重が入力されて、乗員から支持プレート１０に所定値以上の大きな後方荷重が作用すると、下方のワイヤ部材１５の屈曲係止部１５ｃが第２突起１８を乗り越えて第２突起１８によるＵ字湾曲部１５ｂの拘束を解除されるとともに、上方側のワイヤ部材１４の直線部１４ａが係止フック２９内を軸方向に摺動して係止フック２９による屈曲部１４ｂの拘束を解除される。したがって、これにより支持プレート１０が後方に大きく変位して、乗員の背部から腰部に渡る領域を深く沈みこませるようになる。 On the other hand, when a large impact load is input from the rear of the vehicle and a large rear load of a predetermined value or more acts on the support plate 10 from the occupant, the bending locking portion 15c of the lower wire member 15 climbs over the second protrusion 18 to The restraint of the U-shaped curved portion 15b by the two protrusions 18 is released, and the linear portion 14a of the upper wire member 14 slides in the locking hook 29 in the axial direction so that the bent portion 14b of the locking hook 29 is bent. Restraint is released. Accordingly, the support plate 10 is greatly displaced rearward thereby, and the region extending from the back of the occupant to the waist is submerged deeply.

また、上記のようにワイヤ部材１４，１５の各撓み部（屈曲部１４ｂ及びＵ字湾曲部１５ｂ）の拘束が解除された後に、支持プレート１０に作用する後方荷重が解除されると、上下の各ワイヤ部材１４，１５は自身の持つ弾性により、係止フック２９や第１，第２突起１７，１８によって撓み変位を拘束された初期状態に戻される。
なお、車両後方から大きな衝撃荷重が入力されたときだけでなく、例えば、シートバック３を後方に倒し、その上を子供が膝をついて跳ねた場合にも、ワイヤ部材１４，１５の屈曲部１４ｂやＵ字湾曲部１５ｂの拘束が上記と同様に解除されることがあるが、この場合も子供の飛び跳ねが終了すると、各ワイヤ部材１４，１５は自身の持つ弾性によって初期状態に戻される。 Further, when the rear load acting on the support plate 10 is released after the restraint of the bent portions (the bent portion 14b and the U-shaped curved portion 15b) of the wire members 14 and 15 is released as described above, Each of the wire members 14 and 15 is returned to the initial state in which the bending displacement is restrained by the locking hook 29 and the first and second protrusions 17 and 18 due to its own elasticity.
The bent portions 14b of the wire members 14 and 15 are not only when a large impact load is input from the rear of the vehicle, but also when, for example, the seat back 3 is tilted backward and the child jumps on the knee with the knees on it. Although the restraint of the U-shaped curved portion 15b may be released in the same manner as described above, in this case as well, when the jumping of the child is completed, the wire members 14 and 15 are returned to the initial state by their own elasticity.

以上のように、この車両用シート１は、上部のワイヤ部材１４の屈曲部１４ｂの伸び変位を拘束する係止フック２９と、下部のワイヤ部材１５のＵ字湾曲部１５ｂの伸び変位を規制する第１，第２突起１７，１８が支持プレート１０に設けられ、所定値以上の後方荷重が乗員から支持プレート１０に作用したときに、係止フック２９と第１，第２突起１７，１８による各ワイヤ部材１４，１５の変位規制が解除される構造とされているため、支持プレート１０によって乗員の背部を安定的に支持しつつ、シートバック３の厚肉化や複雑化を招くことのない簡単な構造によって、衝撃荷重の入力時に乗員の背部から腰部に亙る領域を深く沈み込ませることができる。したがって、シートバック３の支持性能の向上とともに薄肉化と構造の簡素化を図りつつ、乗員の頸部を確実に保護することができる。 As described above, the vehicle seat 1 restricts the extension displacement of the locking hook 29 that restrains the extension displacement of the bent portion 14 b of the upper wire member 14 and the U-shaped curved portion 15 b of the lower wire member 15. When the first and second protrusions 17 and 18 are provided on the support plate 10 and a rear load of a predetermined value or more is applied to the support plate 10 from the occupant, the locking hook 29 and the first and second protrusions 17 and 18 Since the displacement restriction of each of the wire members 14 and 15 is released, the seat back 3 is not increased in thickness and complexity while stably supporting the back of the occupant by the support plate 10. With a simple structure, it is possible to sink deeply into the region from the back of the occupant to the waist when an impact load is input. Accordingly, it is possible to reliably protect the occupant's neck while improving the support performance of the seat back 3 and reducing the thickness and simplifying the structure.

特に、この実施形態の車両用シート１においては、下側のワイヤ部材１５のＵ字湾曲部１５ｂの伸び変位が支持プレート１０に突設された第１，第２突起１７，１８によって拘束されるとともに、上側のワイヤ部材１４の屈曲部１４ｂの伸びが支持プレート１０に設けられた係止フック２９によって拘束され、所定値以上の荷重が乗員から支持プレート１０に作用したときに、下側のワイヤ部材１５のＵ字湾曲部１５ｂが第２突起１８を乗り越え、上側のワイヤ部材１４の直線部１４ａが係止フック２９から離脱する構造とされているため、極めて簡単な構造によってシートバック３の薄肉化と乗員の頸部保護の両立を図ることができる。 In particular, in the vehicle seat 1 of this embodiment, the extension displacement of the U-shaped curved portion 15b of the lower wire member 15 is restrained by the first and second protrusions 17 and 18 projecting from the support plate 10. At the same time, the extension of the bent portion 14b of the upper wire member 14 is restrained by the locking hook 29 provided on the support plate 10, and when a load of a predetermined value or more is applied to the support plate 10 from the occupant, the lower wire Since the U-shaped curved portion 15b of the member 15 gets over the second protrusion 18 and the straight portion 14a of the upper wire member 14 is detached from the locking hook 29, the seat back 3 can be made thin with a very simple structure. Compatibility with occupant neck protection.

また、この実施形態の車両用シート１の場合、支持プレート１０に所定値以上の後方荷重が作用して、下方側のワイヤ部材１５のＵ字湾曲部１５ｂが第２突起１８を乗り越えて伸び変位するときに、変位規制ブロック１９によってＵ字湾曲部１５ｂの過大な変位が規制される構造とされているため、ワイヤ部材１５に塑性変形が生じるのを未然に防止し、ワイヤ部材１５の所期の性能を長期にわたって安定的に維持することができるという利点がある。 Further, in the case of the vehicle seat 1 of this embodiment, a rear load of a predetermined value or more acts on the support plate 10, and the U-shaped curved portion 15 b of the lower wire member 15 gets over the second protrusion 18 and extends and displaces. In this case, since the displacement restricting block 19 restricts excessive displacement of the U-shaped curved portion 15b, it is possible to prevent the wire member 15 from being plastically deformed. There is an advantage that the performance can be stably maintained over a long period of time.

なお、上記の実施形態においては、支持プレート１０（板状支持ブロック）の上下にそれぞれワイヤ部材とワイヤ拘束部が設けられているが、これらは上下の一方のみに設けるようにしても良い。
また、上記の例においては、乗員の後方荷重を受け止める板状支持ブロックとして合成樹脂製の支持プレート１０を採用しているが、板状支持ブロックはこの支持プレート１０に限らず、例えば、図６，図７に示すように複数のワイヤ部材を格子状に組み付けたワイヤブロック１１０によって構成するようにしても良い。
この変形例の場合、ワイヤ部材１５の両側の屈曲係止部１５ｃの屈曲内側面に係合される第２突起１８は、図７の断面図に示すように、ワイヤブロック１１０の略水平方向に延出するワイヤ部材１２の一部を後方側に屈曲させることによって形成されている。なお、図６，図７に示す変形例については、上記の実施形態の説明と同一部分に同一符号を付して重複する説明を省略する。
また、図６，図７に示す変形例においては、ワイヤブロック１１０のワイヤ部材に第１突起１７や第２突起１８を直接設けるようにしているが、第１，第２突起１７，１８や係止フックを設置するための専用の小型の板状部材を設け、その板状部材をワイヤブロック１１０に取り付けるようにしても良い。 In the above embodiment, the wire member and the wire restraining portion are provided above and below the support plate 10 (plate-like support block), respectively, but these may be provided only on one of the top and bottom.
Further, in the above example, the synthetic resin support plate 10 is adopted as a plate-like support block that receives the occupant's rear load. However, the plate-like support block is not limited to this support plate 10, and for example, FIG. As shown in FIG. 7, a wire block 110 in which a plurality of wire members are assembled in a lattice shape may be used.
In the case of this modification, the second protrusions 18 engaged with the bent inner surfaces of the bending locking portions 15c on both sides of the wire member 15 are arranged in a substantially horizontal direction of the wire block 110 as shown in the sectional view of FIG. It is formed by bending a part of the extending wire member 12 backward. In addition, about the modification shown in FIG. 6, FIG. 7, the same code | symbol is attached | subjected to the same part as description of said embodiment, and the overlapping description is abbreviate | omitted.
6 and 7, the first protrusion 17 and the second protrusion 18 are directly provided on the wire member of the wire block 110, but the first and second protrusions 17 and 18 and the engagement are not provided. A dedicated small plate-like member for installing the stop hook may be provided, and the plate-like member may be attached to the wire block 110.

次に、図８〜図１０に示す第２の実施形態について説明する。
図８は、シートバック２０３の一部を示す背面図であり、図９，図１０は、図８のＡ−Ａ部、Ｂ−Ｂ部にそれぞれ対応する断面図である。
この実施形態の車両用シート２０１は、板状支持ブロックである合成樹脂製の支持プレート１０の背面に一対の略直方体状の凸状ブロック４０（突起部）がシート幅方向に離間して設けられ、この各凸状ブロック４０の上部側の略直角に屈曲した肩部に、ワイヤ部材２１５側に設けられたコ字状の屈曲係止部２１５ｃが係合されるようになっている。また、ワイヤ部材２１５の左右の屈曲係止部２１５ｃ間には下方側に向かって湾曲するＵ字湾曲部２１５ｂ（撓み部）が設けられ、各屈曲係止部２１５ｃのシート幅方向外側には上下に交互に屈曲したばね部４１が設けられている。
各凸状ブロック４０は、図９に示すようにシート幅方向内側の突出高さが外側の突出高さよりも低くなるように、その上面が傾斜している。また、図１０に示すように、各凸状ブロック４０には、下端側から上端側に向かって突出高さが次第に低くなるようにテーパ面４０ａが設けられている。 Next, a second embodiment shown in FIGS. 8 to 10 will be described.
FIG. 8 is a rear view showing a part of the seat back 203, and FIGS. 9 and 10 are cross-sectional views corresponding to the AA and BB parts of FIG. 8, respectively.
In the vehicle seat 201 of this embodiment, a pair of substantially rectangular parallelepiped convex blocks 40 (protrusions) are provided apart from each other in the seat width direction on the back surface of a synthetic resin support plate 10 that is a plate-like support block. A U-shaped bent locking portion 215c provided on the wire member 215 side is engaged with a shoulder portion bent at a substantially right angle on the upper side of each convex block 40. In addition, a U-shaped bending portion 215b (flexure portion) that curves downward is provided between the left and right bending locking portions 215c of the wire member 215, and the bending locking portions 215c are vertically moved to the outside in the sheet width direction. Spring portions 41 that are alternately bent are provided.
As shown in FIG. 9, the upper surface of each convex block 40 is inclined so that the protruding height on the inner side in the sheet width direction is lower than the protruding height on the outer side. As shown in FIG. 10, each convex block 40 is provided with a tapered surface 40a so that the protruding height gradually decreases from the lower end side toward the upper end side.

この車両用シート２０１は、乗員の通常着座時に乗員の上体の荷重が支持プレート１０に作用すると、支持プレート１０の全域が撓み変形すると同時に、乗員の荷重がワイヤ部材２１５を介してシートバックフレーム１３に伝達される。このとき、ワイヤ部材２１５は、屈曲係止部２１５ｃで凸状ブロック４０に係合し、Ｕ字湾曲部２１５ｂの伸び変位が規制されている。したがって、このとき支持プレート１０に入力された振動や微小な衝撃はワイヤ部材２１５の主にばね部４１によって吸収される。 The vehicle seat 201 is configured such that when the occupant's upper body load is applied to the support plate 10 when the occupant is normally seated, the entire region of the support plate 10 is bent and deformed, and at the same time, the occupant's load is transmitted through the wire member 215 to 13 is transmitted. At this time, the wire member 215 is engaged with the convex block 40 by the bending locking portion 215c, and the expansion displacement of the U-shaped bending portion 215b is restricted. Accordingly, vibrations and minute impacts input to the support plate 10 at this time are absorbed mainly by the spring portion 41 of the wire member 215.

また、車両後方から大きな衝撃荷重が入力されて、乗員から支持プレート１０に所定値以上の荷重が作用すると、図９，図１０に示すようにワイヤ部材２１５の屈曲部２１５ｃとＵ字湾曲部２１５ｂが凸状ブロック４０のテーパ面４０ａ上に乗り上げ、このときＵ字湾曲部２１５ｂの伸び変位の規制が解除される。したがって、これにより支持プレート１０が後方に大きく変位して、乗員の背部から腰部に渡る領域を深く沈み込ませる。
また、Ｕ字湾曲部２１５ｃの復帰時には、屈曲部２１５ｃとＵ字湾曲部２１５ｂが凸状ブロック４０の上面を摺動して初期状態に戻される。なお、このとき凸状ブロック４０の上面には、図９に示すようにシート幅方向外側の突出高さの低い傾斜が設けられているため、屈曲部２１５ｃとＵ字湾曲部２１５ｂはスムーズに初期位置に復帰する。 Further, when a large impact load is input from the rear of the vehicle and a load of a predetermined value or more acts on the support plate 10 from the occupant, the bent portion 215c and the U-shaped curved portion 215b of the wire member 215 are shown in FIGS. Rides on the tapered surface 40a of the convex block 40, and at this time, the restriction of the extension displacement of the U-shaped curved portion 215b is released. Accordingly, the support plate 10 is greatly displaced rearward by this, and the region extending from the back of the occupant to the waist is deeply sunk.
Further, when the U-shaped curved portion 215c is returned, the bent portion 215c and the U-shaped curved portion 215b slide on the upper surface of the convex block 40 to return to the initial state. At this time, as shown in FIG. 9, the upper surface of the convex block 40 is provided with a slope with a low protruding height on the outer side in the seat width direction, so that the bent portion 215c and the U-shaped curved portion 215b are smoothly and initially Return to position.

なお、図１１に示す変形例のように、凸状ブロック４０の上面には、段差状に隆起する突部４０ｂを設け、その突部４０ｂによってワイヤ部材２１５の所定量以上の変位を規制する変位規制部を構成するようにしても良い。 In addition, like the modification shown in FIG. 11, the protrusion 40b which protrudes in a step shape is provided in the upper surface of the convex block 40, and the displacement which controls the displacement more than the predetermined amount of the wire member 215 with the protrusion 40b You may make it comprise a control part.

さらに、図１２に示す別の変形例のように、凸状ブロック４０Ａのシート幅方向両側部分の突出高さを同じに設定し、衝撃荷重の入力直後にワイヤ部材２１５の屈曲部２１５ｃとＵ字湾曲部２１５ｂが凸状ブロック４０Ａから外れた後に、所定値以上の荷重が解放されても、ワイヤ部材２１５が凸状ブロック４０Ａの外側の端部に係止されて初期状態に戻らないようにしても良い。
この場合、衝撃荷重の入力時に乗員の背部から腰部に亙る領域を充分に後退させることが可能になる。 Furthermore, as in another modification shown in FIG. 12, the protruding heights of both sides of the convex block 40A in the sheet width direction are set to be the same, and the bent portion 215c of the wire member 215 and the U-shape are immediately after the impact load is input. Even if a load of a predetermined value or more is released after the curved portion 215b is detached from the convex block 40A, the wire member 215 is locked to the outer end of the convex block 40A so as not to return to the initial state. Also good.
In this case, it is possible to sufficiently retract the region extending from the back of the occupant to the waist when inputting the impact load.

つづいて、図１３〜図１７に示す第３の実施形態について説明する。
図１３，図１４は、乗員の通常着座時におけるシートバック３０３の背面図と斜視図であり、図１５は、図１４のＣ−Ｃ部に対応する断面図である。また、図１６は、所定値以上の後方荷重が作用したときにおけるシートバック３０３の斜視図であり、図１７は、図１６のＤ−Ｄ部に対応する断面図である。 Next, a third embodiment shown in FIGS. 13 to 17 will be described.
13 and 14 are a rear view and a perspective view of the seat back 303 when the occupant is normally seated, and FIG. 15 is a cross-sectional view corresponding to a C-C portion of FIG. 14. FIG. 16 is a perspective view of the seatback 303 when a rear load of a predetermined value or more is applied, and FIG. 17 is a cross-sectional view corresponding to a DD portion of FIG.

この実施形態の車両用シート３０１は、板状支持ブロックである合成樹脂製の支持プレート１０の下部領域をシートバックフレーム１３の左右の側部フレーム部１３ｃ，１３ｄに連結するワイヤ部材３１５が設けられている。
ワイヤ部材３１５は、左右の側部フレーム部１３ｃ，１３ｄとの連結部に隣接して略水平に延出する直線部３１５ａが設けられ、この両側の直線部３１５ａがシート幅方向の中央側で多角形状に複数段に屈曲した屈曲部３１５ｃ（撓み部）を介して相互に連結されている。屈曲部３１５ｃは、左右の直線部３１５ａの端部からそれぞれ下方に屈曲した連結辺部３１５ｃａと、各連結辺部３１５ｃａの下端からシート幅方向外側に屈曲した上辺部３１５ｃｂと、上辺部３１５ｃｂと略平行に配置された下辺部３１５ｃｃと、下辺部３１５ｃｃの両端部と上辺部３１５ｃｂの各端部を連結する側辺部３１５ｃｄとを備えている。屈曲部３１５ｃのうちの下辺部３１５ｃｃは、シートバックフレーム１３の下部フレーム部１３ｂの上面に連結部材５０を介して前後に回動可能に連結されている。 The vehicle seat 301 of this embodiment is provided with a wire member 315 that connects the lower region of the synthetic resin support plate 10, which is a plate-like support block, to the left and right side frame portions 13 c and 13 d of the seat back frame 13. ing.
The wire member 315 is provided with a straight portion 315a extending substantially horizontally adjacent to the connecting portion with the left and right side frame portions 13c and 13d, and the straight portions 315a on both sides are polygonal on the center side in the seat width direction. They are connected to each other via a bent portion 315c (flexible portion) bent in a plurality of stages. The bent portion 315c includes a connecting side portion 315ca bent downward from the ends of the left and right straight portions 315a, an upper side portion 315cb bent outward from the lower end of each connecting side portion 315ca, and an upper side portion 315cb. The lower side part 315cc arrange | positioned in parallel, The side part 315cd which connects the both ends of the lower side part 315cc, and each edge part of the upper side part 315cb are provided. A lower side portion 315cc of the bent portion 315c is connected to the upper surface of the lower frame portion 13b of the seat back frame 13 via a connecting member 50 so as to be able to rotate back and forth.

一方、支持プレート１０の背面側には、ワイヤ部材３１５の両側の直線部３１５ａを係止する係止フック５１と、屈曲部３１５ｃの左右両側の上辺部３１５ｃｂを係止する係止フック５２（フック部，ワイヤ拘束部）が設けられている。これらの係止フック５１，５２は、直線部３１５ａと上辺部３１５ｃｂの各上部と背部を覆うように下向きの略Ｌ字断面に形成されており、それぞれ直線部３１５ａと上辺部３１５ｃｂの上方変位と後方変位を規制するようになっている。係止フック５１，５２は、いずれも下方側が係脱可能に解放されている。 On the other hand, on the back side of the support plate 10, a locking hook 51 that locks the linear portions 315a on both sides of the wire member 315 and a locking hook 52 (hooks) that locks the upper side portions 315cb on both the left and right sides of the bent portion 315c. Part, wire restraint part). These hooks 51 and 52 are formed in a substantially downward L-shaped cross section so as to cover the upper part and the back part of the linear part 315a and the upper side part 315cb, respectively, and the upward displacement of the linear part 315a and the upper side part 315cb, respectively. Backward displacement is regulated. The locking hooks 51 and 52 are both released so that the lower side can be engaged and disengaged.

この車両用シート３０１は、乗員の通常着座時に乗員の荷重が支持プレート１０に作用している間は、ワイヤ部材３１５の両側の直線部３１５ａと、屈曲部３１５ｃの両側の上辺部３１５ｃｂがそれぞれ係止フック５１，５２に係止されることにより、屈曲部３１５ｃの変位が拘束されている。このため、振動や微小な衝撃がワイヤ部材３１５の持つ弾性によって吸収される。 In the vehicle seat 301, the straight portion 315 a on both sides of the wire member 315 and the upper side portions 315 cb on both sides of the bent portion 315 c are engaged while the occupant's load is applied to the support plate 10 during normal seating of the occupant. By being locked to the stop hooks 51 and 52, the displacement of the bent portion 315c is restrained. For this reason, vibrations and minute impacts are absorbed by the elasticity of the wire member 315.

一方、車両後方から大きな衝撃荷重が入力され、乗員から支持プレート１０に所定値以上の後方荷重が作用すると、図１６，図１７に示すように、屈曲部３１５ｃの下辺部３１５ｃｃが下部フレーム部１３ｂに拘束された状態で支持プレート１０が後方に撓み変形することにより、屈曲部３１５ｃの上辺部３１５ｃｂが下方に引っ張られ、係止フック５２から下方に抜け出る。これにより、係止フック５１，５２による屈曲部３１５ｃの拘束が解除され、支持プレート１０が後方に大きく変位することになる。この結果、乗員の背部から腰部に渡る領域が深く沈み込み、乗員の頸部が保護される。 On the other hand, when a large impact load is input from the rear of the vehicle and a rear load of a predetermined value or more acts on the support plate 10 from the occupant, as shown in FIGS. 16 and 17, the lower side portion 315cc of the bent portion 315c becomes the lower frame portion 13b. When the support plate 10 is bent backward and deformed in a state of being restrained, the upper side portion 315cb of the bent portion 315c is pulled downward and comes out of the locking hook 52 downward. Thereby, the restraint of the bent portion 315c by the locking hooks 51 and 52 is released, and the support plate 10 is greatly displaced rearward. As a result, the region extending from the back of the occupant to the lumbar region sinks deeply, and the neck of the occupant is protected.

なお、この発明は上記の実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の設計変更が可能である。上記の実施形態においては、ワイヤ部材に形成する撓み部を略Ｕ字形状やコ字形状、多角形状等としたが、図１８に示すように、ワイヤ部材４１５の中間部をループ状に曲げて撓み部５３としたり、図１９に示すように、ワイヤ部材５１５の中間部を上下に交互に曲げて撓み部５４としても良い。図１８，図１９に示す実施形態においては、ワイヤ部材４１５，５１５は左右両側の二つの突起１８によって支持プレート１０に係止されている。
また、図２０に示すように、ワイヤ部材６１５を支持プレート１０に係止させる突起１８は一つであっても良い。 In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. In the above embodiment, the bent portion formed on the wire member is substantially U-shaped, U-shaped, polygonal, etc. However, as shown in FIG. 18, the intermediate portion of the wire member 415 is bent in a loop shape. It is good also as the bending part 53, and as shown in FIG. 19, it is good also as the bending part 54 by bending the intermediate part of the wire member 515 up and down alternately. In the embodiment shown in FIGS. 18 and 19, the wire members 415 and 515 are locked to the support plate 10 by the two protrusions 18 on the left and right sides.
Moreover, as shown in FIG. 20, the protrusion 18 which locks the wire member 615 to the support plate 10 may be one.

１，２０１，３０１…車両用シート
３，２０３，３０３…シートバック
１０…支持プレート（板状支持ブロック）
１３…シートバックフレーム
１４，１５，２１５，３１５，４１５，５１５，６１５…ワイヤ部材
１４ｂ…屈曲部（撓み部）
１５ｂ…Ｕ字湾曲部（撓み部）
１７…第１突起（突起部，ワイヤ拘束部）
１８…第２突起（突起部，ワイヤ拘束部）
１９…変位規制ブロック（変位規制部）
２９…係止フック（フック部，ワイヤ拘束部）
４０，４０Ａ…凸状ブロック（突起部）
５２…係止フック（フック部，ワイヤ拘束部）
１１０…ワイヤブロック（板状支持ブロック）
３１５ｃ…屈曲部（撓み部） 1, 201, 301 ... Vehicle seat 3, 203, 303 ... Seat back 10 ... Support plate (plate-like support block)
13 ... Seat back frame 14, 15, 215, 315, 415, 515, 615 ... Wire member 14b ... Bending part (flexing part)
15b ... U-shaped curved part (flexible part)
17 ... 1st protrusion (protrusion part, wire restraint part)
18 ... 2nd protrusion (protrusion part, wire restraint part)
19 ... Displacement restriction block (displacement restriction part)
29 ... Locking hook (hook part, wire restraint part)
40, 40A ... Convex block (protrusion)
52 ... Locking hook (hook part, wire restraint part)
110 ... Wire block (plate-like support block)
315c ... bent portion (flexible portion)

Claims

A seat back frame forming the outer frame of the seat back;
A plate-like support block that is arranged on the inner side in the width direction of the seat back frame and supports a rear load acting from an occupant and capable of bending deformation,
A vehicle seat comprising: a wire member having a spring characteristic that connects the plate-like support block to the seat back frame;
The wire member is provided with a bending portion,
A wire restraining portion for restraining the displacement of the bending portion of the wire member is provided on the plate-like support block,
The wire restraint portion is configured by a protrusion that protrudes from the plate-like support block and locks the vicinity of the bending portion of the wire member, and the wire member receives a load of a predetermined value or more from the occupant to the plate-like shape. A vehicular seat characterized in that, when acting on a support block, the bent portion is displaced by getting over the protruding portion .

The wire member and the wire restraint portion are when the load exceeding the predetermined value is released after the load of a predetermined value or more is applied to the plate-like support block and the displacement restraint of the bending portion is once released. 2. The vehicle seat according to claim 1, wherein the deformation of the bent portion is set back to an initial state of being restrained by the wire restraining portion by a shape return due to elasticity of the wire member. .

3. The plate-like support block is provided with a displacement restricting portion for restricting a displacement of the wire member by a predetermined amount or more when the wire member gets over the protruding portion. The vehicle seat described in 1.

A seat back frame forming the outer frame of the seat back;
A plate-like support block that is arranged on the inner side in the width direction of the seat back frame and supports a rear load acting from an occupant and capable of bending deformation,
A vehicle seat comprising: a wire member having a spring characteristic that connects the plate-like support block to the seat back frame;
The wire member is provided with a bending portion,
A wire restraining portion for restraining the displacement of the bending portion of the wire member is provided on the plate-like support block,
The wire restraining portion is configured by a hook portion that locks the vicinity of the bending portion of the wire member and is opened so that one direction can be engaged and disengaged, and the wire member receives a load of a predetermined value or more from the occupant to the plate. A vehicle seat characterized in that the flexible portion is displaced when the hook portion is disengaged in the vicinity of the flexible portion when acting on the support block.

The wire member and the wire restraint portion are when the load exceeding the predetermined value is released after the load of a predetermined value or more is applied to the plate-like support block and the displacement restraint of the bending portion is once released. The vehicle seat according to claim 4, wherein the displacement of the bent portion is set back to an initial state of being restrained by the wire restraining portion by a shape return due to elasticity of the wire member. .

A seat back frame forming the outer frame of the seat back;
A plate-like support block that is arranged on the inner side in the width direction of the seat back frame and supports a rear load acting from an occupant and capable of bending deformation,
A vehicle seat comprising: a wire member having a spring characteristic that connects the plate-like support block to the seat back frame;
The wire member is provided with a bending portion,
A wire restraining portion for restraining the displacement of the bending portion of the wire member is provided on the plate-like support block,
The wire restraint portion releases the restraint of the displacement of the bending portion when a load of a predetermined value or more acts on the plate-like support block from an occupant,
The wire member and the wire restraining portion are configured such that after the load of the predetermined value or more acts on the plate-like support block and the restraint of the displacement of the bending portion is once released, the load of the predetermined value or more is released. Further, the vehicular seat is set so that the deflection portion is restrained by the wire restraining portion and the displacement does not return.